Development of new reliability measure for bus routes using trajectory data

Document Type

Journal Article

Publication Date


Subject Area

place - asia, place - urban, mode - bus, operations - reliability, planning - methods


Planning time index (PTI), buffer time index (BTI), GEV (generalized extreme value) distribution, travel time variability, clustering


The present study is focused on evaluating travel time reliability on six bus routes in Mysore city, southern part of India. The travel time data were tested using three potential statistical distributions, namely Burr, generalized extreme value (GEV), and Log-normal distribution. From the hour of the day variability results, it has been noticed that during the peak hours, the bus travel time variability tends to follow normal distribution. Whereas for the off-peak conditions, k value increases and tends to become highly positive. The major contributions of the present study are (i) to highlight the consideration of the shape parameter (k) of GEV distribution to explain the variability of travel time over space and time on a selected bus route, (ii) to highlight the shortfalls and limitations of existing reliability measures, and (iii) to suggest and justify the use of recently developed reliability measure, RBI for evaluating bus travel time reliability.


Permission to publish the abstract has been given by Taylor&Francis, copyright remains with them.